Buddy Roger's has a brand new John Packer 379 CC in silver plate with hard case and mouthpiece, within your budget. If you're familiar with the Hirsbrunner HB-21, or have read reviews on TubeNet about this horn, you'll know what you're getting. Let me know if you're interested.

For that kind of budget, just get an Eastman and call it a day. Fantastic tubas, you won't regret it. There are a lot of great instruments out there they could be had for that price in the used Market. look for a miraphone 188. Can't go wrong with those either